Seiko Cal. 3820 - 391

The Seiko 3820-391 represents an important milestone in Seiko's 1977 lineup. Powered by the 3820 caliber with 24j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-d7ede3ca660c]

Also known as: Samurai

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

9.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

150m

Dial Color

Navy

Jewels

24j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1977

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